Preparation of Nitrate Intercalated Hydrotalcite and Its Anti-Rust Behavior on Steel Bars

doi:10.19894/j.issn.1000-0518.250027

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (12): 1691-1700.DOI: 10.19894/j.issn.1000-0518.250027

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Preparation of Nitrate Intercalated Hydrotalcite and Its Anti-Rust Behavior on Steel Bars

Yuan WEN¹(), Yan-Ru ZHUANG¹, Hui-Quan HONG²^,³

^1.College of Intelligent Construction Engineering，Minnan University of Science and Technology，Quanzhou 362700，China
^2.Institute of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，China
^3.CCCC Fourth Harbor Engineering Institute Co. ，Ltd. ，Guangzhou 510230，China

Received:2025-01-14 Accepted:2025-07-16 Published:2025-12-01 Online:2025-12-30
Contact: Yuan WEN
About author:g1765822347@163.com
Supported by:
the National Natural Science Foundation of China(51972115)

Abstract

Abstract:

Aiming at the problems of easy decomposition， poor timeliness， and environmental pollution of traditional corrosion inhibitors， nitrate （NO $3 -$ ） intercalated hydrotalcite （LDHs-NO₃） was prepared by the co-precipitation method， and its adsorption characteristics of chloride ions and corrosion protection mechanism of steel bars were systematically investigated. The structure of LDHs-NO₃ was characterized by X-ray diffraction （XRD）， Fourier transform infrared spectrometer（FT-IR）， and scanning electron microscopy （SEM）， and the evolution of passive film was analyzed by electrochemical impedance spectroscopy （EIS） and Raman spectroscopy. The results show that LDHs-NO₃ has been successfully synthesized， and the interlayer spacing is 0.87 nm. It exhibits significant structural stability degradation at pH＜7 or pH＞13， and has good stability in neutral to weakly alkaline environments （pH 7~13）. LDHs-NO₃ achieved the adsorption of chloride ions through ion exchange， and the maximum adsorption capacity of Cl? was 17.90 mmol/g. The synergistic effect of LDHs-NO₃ adsorption NO $3 -$ slow release increased the Cl? threshold of steel corrosion from 0.02 to 0.1 mol/L. Raman spectroscopy and SEM analysis showed that LDHs-NO₃ could regulate the content of γ-Fe₂O₃ in the passivation film， and the released NO $3 -$ could form a dense passivation film on the surface of the steel bar， effectively delaying the corrosion of the steel bar.

Key words: Layered double hydroxides, Inhibition mechanisms, Steel corrosion, Chloride ion adsorption

CLC Number:

O643.3

Yuan WEN, Yan-Ru ZHUANG, Hui-Quan HONG. Preparation of Nitrate Intercalated Hydrotalcite and Its Anti-Rust Behavior on Steel Bars[J]. Chinese Journal of Applied Chemistry, 2025, 42(12): 1691-1700.

Figures/Tables 11

Fig.1 （A） XRD and （B） FT-IR patterns of LDHs-NO3

Fig.2 SEM image of LDHs-NO3

Fig.3 Dissolution of LDHs-NO3 soaked in different pH for 30 d

Fig.4 Adsorption isotherm of chloride ion

Fig.5 XRD patterns of LDHs-NO3-Cl

Fig.6 NO3- concentration in the supernatant

Fig.7 SEM image of LDHs-NO3-Cl

Fig.8 Electrochemical impedance spectroscopy （EIS） of steel bar in SCPs

Fig.9 Equivalent circuit model of ESI

Table 1 Fitting results of electrochemical impedance spectroscopy of steel bars in SCPs

No.	c（Cl^-）/（mol·L^-1）	R_s/（Ω·cm²）	R_f/（kΩ·cm²）	10⁵Q_f/（μF·cm²）	n_f	R_ct/（kΩ·cm²）	10⁵Q_dl/（μF·cm²）	n_dl
Blank group	0	23.18	47.65	3.47	0.841	486.35	3.42	0.871
	0.01	22.35	23.94	3.66	0.936	377.24	3.59	0.925
	0.02	21.24	5.68	2.79	0.967	11.26	3.88	0.949
Test group	0	48.23	148.32	3.64	0.921	738.52	3.84	0.924
	0.02	45.61	223.65	3.23	0.914	1142.16	3.35	0.932
	0.04	40.98	287.42	3.48	0.963	1286.35	3.11	0.958
	0.06	39.44	332.96	3.51	0.943	1324.27	3.24	0.946
	0.08	34.88	259.87	3.17	0.827	528.67	3.29	0.933
	0.1	23.67	14.33	3.42	0.886	16.83	3.44	0.927

Fig.10 （A） Raman spectra，（B） blank group and （C） test group SEM images of steel bar surface

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Preparation of Nitrate Intercalated Hydrotalcite and Its Anti-Rust Behavior on Steel Bars

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